Hentze, M.; Hasilik, A.; Figura, Kurt v. (1984). "Enhanced degradation of Cathepsin D synthesized in the presence of the threonine analog beta-hydroxynorvaline". Arch. Biochem. Biophys. 230 (1): 375–82. doi:10.1016/0003-9861(84)90120-6. PMID6424571. Retrieved 6 August 2015.
Hentze, M.; Hasilik, A.; Figura, Kurt v. (1984). "Enhanced degradation of Cathepsin D synthesized in the presence of the threonine analog beta-hydroxynorvaline". Arch. Biochem. Biophys. 230 (1): 375–82. doi:10.1016/0003-9861(84)90120-6. PMID6424571. Retrieved 6 August 2015.